So I’m ahead of myself here, but I’m trying to get an idea of what I need to do since I can’t find anything regarding my combination.

We have the 2.8 out and the 383 currently in the car. Wrapping up the rest of the rear end / brake work currently but then we’re on to wiring. This is my first swap and first car project. While I’m moderately mechanically inclined, I’m a newbie with electric.

It’s a Holley injection system on the motor and I’ll be swapping the original gauge cluster with a Dakota digital VHX cluster. My question is, can I still keep the factory ecm in place, run my sensors through the firewall to the Dakota ecu and lengthen the stuff I need off of the pin harness behind the original cluster to the Dakota ecu as well? When I’m going through this in my head it just seems like it would be a mess. What can I get rid of from the harness’s under the hood? I know I need my 12v, iginition and tach from the original harness that went to the coil.

thanks in advance for your help and going easy on me lol

 

nice project you have there. there are a BUNCh of us who have doen sniper efi stuff on here. do a search using google and include the terms sniper efi and thirdgen.org... don't rely on the search-bar feature on this website. for mine, i got rid of the oem ECm completely. it was just a cleaner, smarter way to do it. However, i don't have digital gauges like you, mine are all ran via sending units (fuel, oil, coolant temp) etc.

for the sniper, you will need a CLEAN switched 12 volt source, typically the pink wire. I say clean, because if you pick a busy wire, it can cause some RFI/EMi issues with your sniper nad datalogs. There are hundreds of discussions about this on the tech forums of the holley site. same thing as above, do a google search and spend some time on the holley pages. https://forums.holley.com/forumdispl...?82-Sniper-EFI

 

should i come off this red for the “clean 12v”? Or run a new wire through the firewall from an unused IGN fuse?

 

I would run a new wire to an unused IGN fuse area OR run one of those "fuse taps"
like this:

https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds

however, make sure you know how to properly find the hot-rail of the fuse block so that your fuse actually does what its supposed to do. if you put it in backwards, the fuse tap will not work right.

 

thats good advice for a first timer. Thank you!

what about the tan wire for the fuel pump? Cut and splice after the relay? Or is there a better way? I think this is the right one.

 

honestly I can't remember about that. maybe someone else can chime in

 

For my clean 12V I ran a relay to a switched IGN source then had that switch a wire right to the battery. Nice and clean line with nothing else on it